bicycle

A two-wheeled vehicle propelled by the rider. The earliest
design dates from about 1790. Karl von Drais of Germany developed an improved
version in about 1816. An Englishman, James Starley, demonstrated the first
successful chain drive in 1871.

Bicycles have been a popular means of transport and recreation in many countries
since the late 1800s. Some modern bicycles feature recent innovations such
as disk brakes, front fork suspension, and the use of carbon fiber to add
strength while reducing overall weight.